code: def test_data_initializes_tensorsizers(self):
      tensorizers = {
          "tokens": TokenTensorizer(text_column="text"),
          "labels": LabelTensorizer(label_column="label"),
      }
      # verify TokenTensorizer isn't in an initialized state yet
      assert tensorizers["tokens"].vocab is None
      Data(self.data_source, tensorizers)
      # Tensorizers should have been initialized
      self.assertEqual(49, len(tensorizers["tokens"].vocab))
      self.assertEqual(7, len(tensorizers["labels"].vocab))
  
imports: import unittest
  from pytext.common.constants import RawExampleFieldName, Stage
  from pytext.data import Batcher, Data, PoolingBatcher
  from pytext.data.data import RowData
  from pytext.data.sources import RawExample
  from pytext.data.sources.data_source import SafeFileWrapper
  from pytext.data.sources.tsv import TSVDataSource
  from pytext.data.tensorizers import LabelTensorizer, TokenTensorizer
  from pytext.data.utils import pad
  from pytext.utils import precision
  from pytext.utils.test import import_tests_module
label_desc: Use image node_id 5 for calling the DataTest obj's underlying member method code with example usage: obj.test_data_initializes_tensorsizers() without return types